Route guiding method for in-vehicle navigation device
US6760662B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 2002 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | Apr 29, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/3655
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A route guiding method for an in-vehicle navigation device. To guide a vehicle to a destination by an optimum route, it is determined whether the vehicle is on track within a predetermined intersection range based on route guidance data received from a traffic information center via a mobile communication network. If the vehicle is on track within the intersection range, it is determined whether the vehicle is in a free run state according to predetermined free run conditions to prevent a preliminary route guidance message that is confusing to a driver in the free run state. According to the determination result, the preliminary route guidance message is selectively provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.